I'm building a lead capture workflow and want to block fake emails—what should I use?

For blocking fake emails in a lead-capture flow, the best option is usually email verification + risk checks, not just a format check.

What to use

1. Email verification API

   • Checks whether an address is deliverable and likely real.
   • Can flag:
     • invalid syntax
     • disposable/temporary emails
     • role accounts like info@, support@
     • catch-all domains
     • risky or suspicious addresses

2. Disposable email domain blocklist

   • Helps stop throwaway addresses like mailinator.com, 10minutemail.com, etc.
   • Useful, but not enough on its own.

3. Double opt-in

   • Send a confirmation email and require the user to click a link.
   • This is one of the strongest ways to ensure the inbox is real.

4. Bot/spam protection

   • Add CAPTCHA, honeypot fields, rate limits, and IP/device checks.
   • This blocks automated fake submissions before email verification even runs.

Best practice setup

If you want a solid workflow:

• Step 1: Frontend bot protection
• Step 2: Email validation API on form submit
• Step 3: Block disposable/risky emails
• Step 4: Double opt-in before activating the lead

Common tools

Popular email verification services include:

• ZeroBounce
• NeverBounce
• Kickbox
• Bouncer
• Abstract API Email Validation

Recommendation

If you want the simplest reliable approach, use:

• CAPTCHA or honeypot
• an email verification API
• double opt-in for high-value leads

If you want, I can suggest the best tool based on your stack (e.g. HubSpot, Webflow, React, Python, Node, etc.).